SQL Plus Interview Preparation Guide
Sharpen your SQL Plus interview expertise with our handpicked 20 questions. These questions are specifically selected to challenge and enhance your knowledge in SQL Plus. Perfect for all proficiency levels, they are key to your interview success. Access the free PDF to get all 20 questions and give yourself the best chance of acing your SQL Plus interview. This resource is perfect for thorough preparation and confidence building.20 SQL Plus Questions and Answers:
1 :: Please Explain Connect by Prior?
Retrieves rows in hierarchical order.e.g. select empno, ename from emp where.
"connect by prior" is clause which is used in hierarchical queries.Example
select ename,empno,mgr,job
from emp
start with job='PRESIDENT'
connect by prior empno=mgr;
"connect by prior" is clause which is used in hierarchical queries.Example
select ename,empno,mgr,job
from emp
start with job='PRESIDENT'
connect by prior empno=mgr;
2 :: Explain ROWID?
ROWID is a pseudo column generated at the run time(during inserting value). Its a hexadecimal value which is unique identification for each record
3 :: Explain Explicit Cursor attributes?
%IS OPEN,%FOUND,%NOT FOUND,%ROW COUNT
4 :: Explain What is a database link?
Database Link is a named path through which a remote database can be accessed
5 :: Explain What is a corelated subquery?
Correlated subquery is the subquery, where the subquery has been executed for the every row processed by the parent statement.
6 :: Explain How to drop the index?
Drop Index Indexname
7 :: What is a join in Oracle? Explain the different types of joins?
Join is a query which retrieves related columns or rows from multiple tables.Self Join - Joining the table with itself.Equi Join - Joining two tables by equating two common columns.Non-Equi Join - Joining two tables by equating two common columns.Outer Join - Joining two tables in such a way that query can also retrieve rows that do not have corresponding join value in the other table.
JOIN: Return rows when there is at least one match in both tables
LEFT JOIN: Return all rows from the left table, even if there are no matches in the right table
RIGHT JOIN: Return all rows from the right table, even if there are no matches in the left table
FULL JOIN: Return rows when there is a match in one of the tables
JOIN: Return rows when there is at least one match in both tables
LEFT JOIN: Return all rows from the left table, even if there are no matches in the right table
RIGHT JOIN: Return all rows from the right table, even if there are no matches in the left table
FULL JOIN: Return rows when there is a match in one of the tables
8 :: Explain What are the data types allowed in a table?
CHAR,
VARCHAR2,
NUMBER,
DATE,
RAW,
LONG and
LONG RAW.
VARCHAR2,
NUMBER,
DATE,
RAW,
LONG and
LONG RAW.
9 :: Explain How do we replace a comma (,) with a blank in a select statement?
select empno||' '||ename from emp;
select replace (column name,',','') from table name.
select replace (column name,',','') from table name.
10 :: Explain Can a view be updated/inserted/deleted?
if a view is update, deleted , or inserted wil the changes be refelected on the base table